Functioning of the electronics:
Once a voltage > 0,5V to the 10V interface is, the interface adapter takes over controlling and the system and lock(disable) the buttons on the controller. Voltage will be < 0,5V normal controller operation and the buttons are again released. So can the interface adapter stay connected without performing a function.

If the Aquarium(tank)-computer voltage under 0,5V the 0-10V interface is shut down and the pump can be operated manually. From 0,5V, the interface will take over control of the scheme. In the area of 0,5V-0,8V the pump is switched off. From ~ 0,8V starts the pump at the lowest level (20W) and run. At an increase of 0,5V will increase the level, also. So 1V = 20W ….. 9V = 230W.

At a higher input voltage remains the Speedycontroller to the maximum setting are available and no longer increases. The interface adapter behaves as if the corresponding would push the button.